A few days ago now I purchased both of these games together in a bundle:

Amazing basketball sim from the same people who made the original Total Pro Basketball sim game. I can just sit here all day playing and making adjustments. It's for real basketball junkies/nerds like me who don't mind reading a lot of statistics and have decent NBA knowledge. Already started a game with my Bobcats, great fun! Also you can even start off as a GM/Coach in the D-league!

Also my knowledge of the real life College game is far more limited, but its fake players in the College video game anyway, but its still amazing too. You have to start of with a small less well known school and try to build up the schools prestige and attract the best recruits possible, while of course trying to win every game you can. If your able to do a good job with them, then you'll get some of the bigger name schools trying to hire you :) It also contains both the NCAA and NIT competitions too.

You can use the College game and import the draft classes from that into your Pro Basketball game too which is a nice feature.

When you purchase the game from there, you can download it straight to your computer, and once the order is confirmed they email you with a licence key to enter in to unlock the full game, so no waiting about for deliveries either, just play it straight away. You can also order a backup CD in case you get a new computer or something.

Anyway, it may not be your sort of thing, this is for purely hardcore ballers who don't mind reading a lot of statistics and figuring out a lot of different stuff, and frankly all the features do take a little while to get used to, but I must say I'm completely addicted to both games!